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It's a mystery how butterflies manage to make their brilliant wing colors, but Yale physicists got a glimpse when they took the question to the lab, breeding dull brown butterflies into purple ones.

The Exxon Mobil CEO had, at times, a shaky hearing before the Senate Foreign Relations Committee on Wednesday. He's still expected to win confirmation, but perhaps narrowly.

The FBI has arrested a member of the Massachusetts Air National Guard, Jack Teixeira, as a suspect in the leak of classified intelligence documents.

The House Jan. 6 committee preps for a primetime hearing. Poll: A majority of Americans blame Trump for Jan. 6 insurrection. The pipeline that brings natural gas from Russia to Germany is to reopen.

The Department of Justice hired a former Jan. 6 defendant who was caught on tape urging rioters to "kill" police. The department calls him a "valued member" of the administration.

Arizona's largest hospital system is nearing ICU bed capacity as coronavirus cases surge. Will Humble, the state's ex-health chief, urges a new executive order requiring Arizonans to wear face masks.

Prime Minister Theresa May is taking flak from across the ideological spectrum amid a series of resignations. Some are demanding a no-confidence vote; others are demanding an entirely new referendum.

Special counsel Robert Mueller hasn't closed the door on a hearing but has said his report includes everything he would have to say. Lawmakers could play by those rules and still learn something new.

Despite calls for Joe Biden to choose a Black woman as his vice presidential pick, many progressives are urging him to choose Sen. Elizabeth Warren instead.

Rescue workers fanned across Turkey and Syria in a second day of desperate searches to find survivors from the massive earthquake and aftershocks that had the death toll climbing by the hour.